Ratera Castle, also known as Castillo Molino de Ratera (in Catalan: Castell de Ratera or Castell Molí de Ratera) is located in the municipality of Els Plans de Sió in the region of La Segarra.
It dates from the ninth century, when it was very likely a second fortification of the castle of Concabella, since in fact it is in the municipality of Concabella.
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Route of the castles of the Sió river in La Segarra